JP3546070B2 - CO safety device for combustion equipment - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a CO safety device for combustion equipment, such as an indoor water heater, for ensuring the safety against carbon monoxide gas.
[0002]
[Prior art]
FIG. 5 shows a schematic structure of a water heater generally known as a combustion device, and FIG. 6 shows a use mode in which the water heater 1 is installed in a room of a building.
[0003]
The operation of this type of water heater 1 is controlled by a control device 6. When the water faucet 9 is opened and the flow sensor 21 provided in the water supply pipe 22 detects a feed water flow, the control device 6 operates. The air in the room is sent to the burner 4 through the filter 3 by the rotation of the fan 2 and the gas valve 20 is opened to burn the combustion gas supplied to the burner 4 to heat the heat exchanger 5. The hot water is passed through a hot water supply pipe 23 connected to the outlet side of the heat exchanger 5 to supply hot water to a desired place such as a kitchen.
[0004]
When the water heater 1 is installed indoors, the base of the chimney 10 is fitted and attached to the exhaust outlet tube portion 8 of the water heater 1, the tip side of the chimney 10 is taken out of the building, and the indoor air is taken in for combustion. The exhaust gas that is emitted is discharged outside the building.
[0005]
When this type of water heater 1 is operated for combustion, if a strong wind blows into the exhaust port of the chimney 10, incomplete combustion occurs and carbon monoxide gas (hereinafter referred to as CO gas) is generated. In the state where exhaust gas is completely exhausted outside through the chimney 10, the effect of CO gas in the room does not occur.However, if a gap is formed at the seam of the chimney 10 or the joint comes off, that part enters the room. There is a danger that the CO gas will flow back and cause CO gas poisoning.
[0006]
For this reason, conventionally, as shown in FIG. 5, a CO sensor 11 is installed on the exhaust side of the water heater 1 to issue an alarm when the concentration of CO gas in the exhaust gas reaches a dangerous concentration, or to perform combustion. Safety measures such as stopping operation are taken.
[0007]
[Problems to be solved by the invention]
However, when a person is exposed to the exhaust gas, even if the CO gas concentration is below the dangerous concentration, the blood hemoglobin CO concentration taken into the blood gradually increases, and the blood hemoglobin CO concentration becomes lower. The dangerous concentration may be reached and CO gas poisoning may occur. As shown in FIG. 4, the blood hemoglobin CO concentration taken into the blood varies depending on the time required to reach a dangerous concentration of the blood hemoglobin CO concentration (for example, blood hemoglobin CO concentration 25%) depending on the CO concentration in the exhaust gas. Even if the concentration of CO in the exhaust gas is low, for example, 1000 ppm, the dangerous concentration of the hemoglobin CO concentration in the blood will be reached over time, so the CO sensor 11 in FIG. Since the determination alone did not consider the blood hemoglobin CO concentration at all, there was a great problem in safety against CO gas poisoning.
[0008]
Then, as shown in FIG. 8, the applicants have, for example, an initial detection time t of the CO concentration in the exhaust gas.₀From this, the CO in the exhaust gas is detected at each sampling time, and when a person is exposed to the atmosphere of the detected CO concentration, the blood hemoglobin CO concentration taken into the blood is determined at every time t. Multiply, for example, D₁+ D_Two+ D_Three..... D_nTime t_nSometimes, when the blood hemoglobin total concentration reaches the value of the area D indicated by oblique lines as the risk reference value of the blood hemoglobin CO concentration given in advance, the value is determined to be the risk reference concentration, and combustion is stopped. It is proposed that safety measures be taken.
[0009]
However, as shown in FIG. 7, the CO sensor 11 does not stabilize the sensor output unless the detected CO gas concentration reaches a predetermined concentration (usually 1000 ppm). It was unstable and could not be used, and the CO concentration could not be specified. Therefore, when the CO detection signal cannot be used (is not adopted) at the CO concentration, there is a blank time during which the CO concentration is not detected. For this reason, after the combustion operation of the water heater or the like is started, CO gas is generated in the exhaust gas, and the blank time T until the CO concentration reaches 1000 ppm as shown in FIG._EMDuring this time, the blood hemoglobin CO concentration taken into the blood could not be detected.
[0010]
Further, as shown in FIG. 9A, even when the CO gas concentration temporarily exceeds 1000 ppm and the CO gas concentration is detected during the combustion operation, in the period before and after the detection section, In some cases, a low-concentration CO gas of less than 1000 ppm, which is not detected by the CO sensor 11, may be generated. In this case as well, there is a problem that the CO gas generated during the blank time is not taken into consideration. As shown in), during the combustion operation, even if no CO detection signal is output from the CO sensor 11, a low-concentration CO gas that is not detected by the CO sensor 11 may be generated. The blood hemoglobin CO concentration taken into the blood by the low-concentration CO gas is not considered at all. As described above, in the proposed example, since the blood hemoglobin CO concentration taken into the blood during the blank time is not considered at all, the blood hemoglobin CO concentration actually taken into the blood is higher than the risk reference concentration during the blank time. Therefore, the blood hemoglobin CO concentration taken into the blood increases by an amount corresponding to the blood hemoglobin CO concentration, and exceeds the risk standard concentration. Therefore, this method is still insufficient in terms of security, and there is room for improvement.
[0011]
The present invention has been made in order to solve the above-mentioned problem, and the object is to make the actual hemoglobin CO concentration taken into the blood into consideration in a blank time during which the CO concentration during the combustion operation is not detected, thereby realizing a more practical operation. To determine the dangerous concentration by approaching the blood hemoglobin CO concentration of the combustion equipment, and to provide a CO safety device for the combustion equipment capable of improving the reliability of safe operation due to CO gas poisoning in the exhaust gas discharged from the combustion equipment. is there.
[0012]
[Means for Solving the Problems]
The present invention is configured as follows to achieve the above object. That is, the CO safety device for a combustion device according to the first invention includes a CO concentration detection unit that detects a CO concentration in exhaust gas of the combustion device by a sensor, and a CO detection signal from the sensor during a combustion operation of the combustion device. A blank time measuring unit that measures an unusable blank time, and a blood hemoglobin CO concentration taken into blood when exposed to an exhaust gas atmosphere having a low estimated CO concentration that cannot be detected by the sensor during the blank time. A CO concentration estimating calculation unit for estimating and calculating blood hemoglobin CO concentration taken in blood when exposed to a CO gas atmosphere having a detected CO concentration based on CO concentration detection data detected by a sensor during combustion operation. Then, the calculated blood hemoglobin CO concentration is integrated with the blood hemoglobin CO estimated concentration obtained by the CO concentration estimation calculating section. And an alarm output unit that outputs an alarm signal when the blood hemoglobin total CO concentration calculated by the CO concentration total calculation unit exceeds a predetermined alarm reference value. ing.
[0013]
A CO safety device for a combustion device according to a second aspect of the present invention includes a CO concentration detection unit that detects a CO concentration in exhaust gas of the combustion device with a sensor, and a CO detection signal from the sensor during a combustion operation of the combustion device. A blank time measuring unit that measures an unusable blank time, and a blood hemoglobin CO concentration taken into blood when exposed to an exhaust gas atmosphere having a low estimated CO concentration that cannot be detected by the sensor during the blank time. A CO concentration estimating calculation unit for estimating and calculating blood hemoglobin CO concentration taken in blood when exposed to a CO gas atmosphere having a detected CO concentration based on CO concentration detection data detected by a sensor during combustion operation. A CO concentration totalizer that integrates the calculated blood hemoglobin CO concentration with the estimated blood hemoglobin CO concentration obtained by the CO concentration estimation calculation unit. The arithmetic unit, when the CO detection signal is not output from the sensor during the combustion operation, the blood hemoglobin CO concentration is dangerous when the combustion operation time from the start of the combustion operation is exposed to the exhaust gas atmosphere having the estimated CO concentration. And a combustion operation stop unit that stops the combustion operation when a preset combustion limit time within the danger time to reach the concentration is reached..
[0014]
[Action]
In the present invention having the above configuration,For example,When the combustion operation is started, the blank time during which the CO detection signal from the sensor cannot be used is measured by the blank time measuring unit. During the blank time, the CO concentration estimation calculation unit assumes that CO gas having a low estimated CO concentration that cannot be detected by the sensor is generated, and is exposed to the exhaust gas atmosphere having the estimated CO concentration. Then, the blood hemoglobin CO concentration taken into the blood at the time of estimation is estimated and calculated. On the other hand, when a CO detection signal is output from the sensor, the blood hemoglobin CO concentration taken into the blood when exposed to the CO gas atmosphere of the detected CO concentration is calculated, and the CO concentration total calculating unit calculates The actual blood hemoglobin CO concentration and the estimated blood hemoglobin CO concentration are integrated (added), and an alarm is output by the alarm output unit when the blood hemoglobin total CO concentration exceeds a predetermined alarm reference value. A signal is output. By using this alarm signal to warn of CO gas leakage and stop combustion, safety against CO gas poisoning is achieved.
[0015]
Further, even when the situation where the CO detection signal from the sensor cannot be used during the combustion operation continues, the combustion operation time (blank time) from the start of the combustion operation is measured, and the combustion operation time is measured in the exhaust gas atmosphere having the estimated CO concentration. When the hemoglobin CO concentration in the blood reaches the combustion limit time before reaching the dangerous concentration when exposed, the combustion operation is forcibly stopped by the combustion operation stop unit, so that safety against CO gas is achieved. .
[0016]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same names as those in the conventional example, and detailed description thereof will be omitted. In the present embodiment, as in the prior art, the safety against CO gas poisoning in indoor-installed combustion equipment such as a water heater or a water heater is provided, and a CO sensor for detecting the CO gas concentration in the exhaust gas of the water heater 1 is provided. 11 is provided at a desired position in the exhaust path of the water heater 1.
[0017]
FIG. 1 shows an example of a block configuration of a CO safety device for a combustion device according to the present embodiment. The CO safety device according to the present embodiment includes a CO concentration detection unit 12, a blank time measurement unit 13, and a CO concentration estimation calculation. It comprises a unit 16, a CO concentration total calculation unit 17, an alarm output unit 14, and a combustion operation stop unit 15.
[0018]
The CO concentration detection unit 12 detects the CO concentration at every unit detection time t during the combustion operation of the water heater 1. For example, when the unit detection time t is set to 10 seconds, the CO detection value from the CO sensor 11 is sampled every second, and the average value of the sampled values is used as the CO concentration detection value of the unit detection time t during the blank time. The measurement unit 13, the CO concentration estimation calculation unit 16, the CO concentration total calculation unit 17, and the alarm output unit 14 are added.
[0019]
The blank time measuring unit 13 uses the timer 18 to perform a blank time during which no CO concentration detection signal is applied from the CO concentration detecting unit 12 during the combustion operation after the start of the combustion operation (T in FIG. 8)._EM, In FIG._EM1+ T_EM2, In FIG._EM) Is measured. The blank time measuring unit 13 adds the measured time to the CO concentration estimation calculating unit 16.
[0020]
The CO concentration estimation calculation unit 16 exposes a person to an exhaust gas atmosphere having a low estimated CO concentration during the blank time based on the value of the blank time and the data of the detected CO concentration output from the CO sensor 11. The blood hemoglobin CO concentration taken into the blood when it is assumed thatValue ER₀Is calculated, and the calculated value is sent to the CO concentration total calculation unit 17.
[0021]
The CO concentration total calculation unit 17 calculates the estimated calculation value of the blood hemoglobin CO concentration taken into the human blood during the blank time by the CO concentration estimation calculation unit 16 and calculates the estimated value of the exhaust gas detected by actual measurement at every time t. Blood hemoglobin CO concentration taken into the blood when a person is exposed to the atmosphere of each detected CO concentrationDegreeCalculated and estimated operation value ER₀The blood hemoglobin CO concentration measured is sequentially integrated inDegree TCalculate R. That is, assuming that the time at which the blood hemoglobin CO concentration taken into the blood of a person when the person is exposed to the CO gas atmosphere of each concentration reaches the alarm reference value is T, the time T at which the alarm reference value is reached is As shown in the simulation curve of FIG. 4, it differs depending on the CO concentration in the exhaust gas. For example, when the alarm reference value of the blood hemoglobin CO concentration is 25%, the time T when the CO concentration in the exhaust gas is 3000 ppm._AAnd at 2000 ppm the time T_BAnd at 1000 ppm the time T_CTo reach.
[0022]
The time T to reach the alarm reference value of the blood hemoglobin CO concentration_A, T_B, T_CFrom the relationship between and the CO concentration in the exhaust gas, the relationship between each CO concentration in the exhaust gas and each time T at which the blood hemoglobin CO concentration reaches the alarm reference value is obtained as shown in FIG. Thereby, the time T required to reach the alarm concentration of the blood hemoglobin CO concentration is represented by, for example, an E curve in FIG. Here, the vertical axis of the graph represents the CO concentration in the exhaust gas in ppm.
[0023]
As described above, assuming that the time during which a person is exposed to the atmosphere of each CO gas concentration at which the blood hemoglobin CO concentration reaches the alarm reference concentration is t, and the ratio t / T between t and T is ER, for example, When the CO gas atmosphere concentration of the exhaust gas is 3000 ppm, the ratio of the blood hemoglobin CO concentration taken into the blood when exposed to this atmosphere for the unit detection time t to the dangerous concentration is ER = t / T_AER = t / T at 1000 ppm_CIt becomes. That is, ER represents the blood hemoglobin CO concentration taken into the blood during the unit detection time t as a value of the ratio to the dangerous concentration. By integrating the blood hemoglobin CO concentration ER based on the CO gas concentration detection value for each unit detection time t, the total blood hemoglobin CO concentration when exposed to an atmosphere of each CO concentration is dangerous. It is determined by the ratio value to the reference density.
[0024]
The CO concentration estimation calculation unit 16 calculates the blood hemoglobin CO concentration ER taken in the blood during the blank time as follows.₀Is estimated. In the present embodiment, even when the CO detection signal is not output from the CO sensor 11 during the combustion operation, it is estimated that the CO gas having the low-level CO concentration that is not detected by the CO sensor 11 is generated. It is estimated that the generated CO concentration of the CO gas is a constant concentration equal to or lower than the lowest detectable level of the CO sensor 11, and in this embodiment, the CO gas having the lowest detection level A of the CO sensor 11 (1000 ppm in this embodiment) is generated. Then, assuming that the sample was exposed to the atmosphere of the CO gas having the estimated concentration A, the time required for the blood hemoglobin CO concentration to reach the dangerous reference concentration is defined as T.₀For example, in the case of FIG. 8, the blood hemoglobin CO concentration during the blank time is ER₀= T_EM/ T₀Is required.
[0025]
Similarly, the blood hemoglobin CO concentration taken into the blood during the blank time shown in FIG.₀= (T_EM1+ T_EM2) / T₀Similarly, the blood hemoglobin CO concentration taken during the blank time shown in FIG. 10 is the elapsed time T from the start of combustion._EMTo T₀ER divided by₀= T_EM/ T₀Is required. Thus, the total blood hemoglobin CO concentration TR becomes TR = ER₀+ ΣER_nIt means that when TR = 1, the blood hemoglobin CO concentration becomes 25% which is the risk reference concentration. That is, the blood hemoglobin CO concentration reaches 25% of the dangerous reference concentration when the area of the hatched portions in FIGS. 8, 9B and 10B becomes 1.
[0026]
The alarm output unit 14 outputs a first signal when the blood hemoglobin total CO concentration TR calculated by the CO concentration total calculation unit 17 exceeds a predetermined alarm reference value (for example, blood hemoglobin CO concentration 25%). The alarm signal of A is applied to the alarm means 19 and the signal is applied to the combustion operation stopping unit 15 at the same time. Also,Alarm output unit 14When exposed to an atmosphere of a CO gas having an estimated CO concentration A (1000 ppm in this embodiment) of the CO gas assumed to be generated during the blank time, the blood hemoglobin CO concentration becomes 25% of the dangerous concentration. Time T₀Or T for security₀A shorter time than the combustion limit time T_ENDThe alarm output unit 14 does not obtain a CO detection signal from the CO sensor 11 at least once after the start of the combustion operation from the CO concentration detection unit 12, that is, the CO output from the CO concentration detection unit 12. When it is confirmed that no detection signal is output, the combustion stop time T_ENDIs compared with the blank time measured by the blank time measuring unit 13, and the blank measurement time is the combustion stop time T._ENDIs reached, the alarm signal of the first signal A is applied to the alarm means 19 and the combustion operation stopping unit 15.
[0027]
The combustion operation stopping unit 15 receives the alarm signal, closes the gas valve 20, and stops the combustion operation. Upon receiving the alarm signal, the alarm unit 19 notifies the danger by, for example, blinking a lamp or the like or emitting a sound such as a buzzer. When the blood hemoglobin total CO concentration is lower than the dangerous concentration, for example, when the blood hemoglobin CO concentration reaches 15%, the alarm output unit 14 outputs an alarm signal of the second signal B as a preliminary alarm reference value. The warning means 19 and the combustion stopping unit 15 perform respective operations based on the second signal B.
[0028]
This embodiment is configured as described above. Next, the safety operation of the CO safety device of this embodiment will be described based on the flowchart of FIG. First, at step 100, it is determined whether or not the combustion operation switch of the water heater is turned on. When the switch is on, at step 101, the blood hemoglobin total CO concentration TR calculated at the previous combustion operation is set at an alarm reference value (blood hemoglobin). It is determined whether or not the CO concentration is lower than the alarm dangerous concentration (at which the CO concentration becomes 25%) 1.0. If the CO concentration is lower than the alarm reference value 1.0, it is determined in step 102 whether or not the flow rate sensor 21 has detected the flow rate. Then, assuming that the combustion operation has been started, the timer 18 starts counting in step 103. In step 104, it is determined whether or not the CO sensor 11 has stably detected CO in the exhaust gas. When a detection signal of the CO concentration is output, in step 105, the blank time from the start of the timer count to the initial detection of CO is determined. T_EMIs measured. In step 106, the estimated calculated value ER of the blood hemoglobin CO concentration during the blank time₀For example, ER₀= T_EM/ T₀Is calculated as
[0029]
Next, at step 107, the estimated calculated concentration ER₀And the blood hemoglobin CO concentration ER after the blank time is integrated for each time t to obtain the total blood hemoglobin CO concentration TR, TR = ER₀+ ΣER_nAsk by.
[0030]
Next, in step 108, the blood hemoglobin total CO concentration TR is compared with a preliminary alarm set value B lower than the dangerous concentration, and if it is smaller than the set value B, the next step 110 is performed. In step 110, a predetermined combustion limit time (for example, 60 hours) set as safe even when a person is exposed to a low-concentration CO gas atmosphere in which the CO concentration in the exhaust gas is not detected by the CO sensor 11. ) Is compared with the combustion operation time from the start of the combustion operation, and it is determined whether or not it is safe based on the combustion time of the water heater.
[0031]
That is, in step 110, it is determined whether or not the combustion operation time from the start of hot water supply is within the combustion limit time. If it is within the combustion limit time, there is a margin before the dangerous concentration is reached, so the combustion operation is continued. If the faucet 9 is closed in step 111 and the off signal is output from the flow rate sensor 21 during the continuation of the combustion operation, the combustion operation is stopped in step 112. Next, at step 113, counting of the operation stop time is started. On the other hand, when it is determined in step 110 that the combustion time has reached the combustion limit time, it is assumed that the blood hemoglobin CO concentration will reach the dangerous concentration. Therefore, in step 112, the combustion operation is stopped.
[0032]
When the combustion of the water heater 1 is stopped, the CO gas in the room leaks out through a small gap to the outside during the combustion stop period, and the CO gas concentration in the room decreases. When the CO gas concentration in the room decreases, the blood hemoglobin total CO concentration TR attenuates in accordance with the decrease amount of the CO gas. Therefore, in this embodiment, the attenuation constant of the blood hemoglobin total CO concentration TR is obtained, and the attenuation correction of the blood hemoglobin total CO concentration TR is performed in step 113 from the attenuation constant. Here, assuming that the attenuation constant is Q, the attenuation constant Q is Q = e^-KtLK is the assumed number of ventilations per hour during the stop of combustion, and is given by a value of 0.2 for an airtight apartment, for example, based on experience. Further, tL is a time from when the combustion is stopped to when the combustion operation is started again. In this way, when the combustion is stopped, the blood hemoglobin total concentration TR is attenuation-corrected to prepare for the next combustion operation.
[0033]
If it is determined in step 108 that the total hemoglobin CO concentration TR in the blood is equal to or higher than the preliminary alarm set value B, in step 109, the fan 2 is forcibly rotated to increase the combustibility. In step 115, it is again determined whether or not TR is smaller than the danger standard value 1.0. If smaller, that is, if 1.0> TR> B, the combustion operation is stopped in step 116, and in step 117, the preliminary alarm value is set. Output the corresponding signal B. At step 118, the stop time is counted, and when a predetermined time has elapsed, TR is attenuated and corrected as at step 113. At step 119, a reset operation is performed to return the rotation of the fan 2 to the normal mode of normal rotation, and the sequence program is reset. To prepare for the next combustion operation.
[0034]
When it is determined in step 101 that the blood hemoglobin total CO concentration TR calculated in the previous combustion operation is equal to or higher than the alarm reference concentration 1.0, the combustion operation is immediately stopped in step 120, and an alarm signal of signal A is sent in step 121. For example, display is performed by blinking a lamp or the like. In step 122, it is determined whether or not the combustion stop time has passed, for example, four hours. If it is determined that the time has not passed, the combustion operation is not performed. After 4 hours have passed, it is assumed that the CO gas in the room leaks out of the gap and the CO gas in the room becomes completely zero, and in step 123, the value of the blood hemoglobin total CO concentration TR is reset to zero, and The sequence program is reset to prepare for the next combustion operation.
[0035]
According to the present embodiment, the blood hemoglobin CO concentration taken into the blood during the blank time during which no CO concentration is detected by the CO sensor 11 during the combustion operation is estimated, and the estimated calculated value ER₀Since the actual measured value of the blood hemoglobin CO concentration ER taken into the blood is integrated and the safety operation of the water heater is controlled based on the blood hemoglobin total CO concentration TR, the CO concentration Can be accurately and accurately performed, and the safety against CO gas poisoning can be significantly improved.
[0036]
Further, in this embodiment, even during a blank time during which the CO detection signal from the CO sensor 11 cannot be used during the combustion operation, a CO gas having a low level of CO concentration that cannot be detected by the CO sensor 11 is generated within the blank time. Assuming that the CO concentration has been reached, the CO concentration is estimated, and when exposed to a CO gas atmosphere having the estimated CO concentration, a safe combustion limit time within a time to reach a dangerous concentration is set. Since the combustion operation is stopped when the combustion limit time is reached, safety against CO gas is ensured.
[0037]
Note that the present invention is not limited to the above-described embodiment, and can adopt various embodiments. For example, in the above embodiment, the CO sensor 11 was used as a sensor for detecting the CO concentration._TwoThe CO concentration may be measured indirectly using a sensor or the like.
[0038]
Further, in the above embodiment, the CO sensor is provided in the exhaust path of the water heater 1, but it may be provided in a room in which a combustion device such as a water heater is installed.
[0039]
Further, in the above embodiment, the alarm reference value of the blood hemoglobin CO concentration is set to 25%. However, this alarm reference value may be arbitrarily set to a value of a different concentration such as 15% from the viewpoint of safety. it can. In addition, various methods can be used for obtaining the ER, such as using an operation or a matrix.
[0040]
Furthermore, in the above-mentioned embodiment, the combustion equipment has been described by taking the gas-fired water heater as an example, but the present invention can be applied to a water heater other than the gas-fired water heater, for example, an oil-fired water heater. . In addition, the present invention is applied as a CO safety device for various combustion devices using gas or oil, such as bath kettles and heaters other than water heaters.
[0041]
Furthermore, in the above-described embodiment, the unit detection time t of the CO concentration is set to 10 seconds, but this time can be set arbitrarily. In the above-described embodiment, the CO sampled every second is sampled. Although the detection values of the sensors are averaged and the average value is used as the CO concentration, it is not necessarily limited to the embodiment.
[0042]
Further, in the above embodiment, the CO concentration generated during the blank time is estimated as the lowest level A (1000 ppm for a general CO sensor) detectable by the CO sensor 11, but the CO generated during the blank time is estimated. The estimated value of the concentration is not necessarily limited to this, and may be set at a value lower than the detectable level of the sensor 11, and in this embodiment, the CO gas is kept at a constant concentration during the blank time. Although it is estimated that CO gas is generated, it may be estimated that CO gas having a time function concentration of various graph patterns that change with time is generated.
[0043]
【The invention's effect】
The present invention relates to a blood hemoglobin CO concentration taken in blood during a blank time during which no CO concentration is detected during a combustion operation of a combustion device.DegreeIt is obtained by an estimation operation, and this estimation operationTo the value, Blood hemoglobin CO concentration taken into the blood in an atmosphere of the CO detection concentration actually detected by the sensorDegreeThe total blood hemoglobin total CO concentrationEvery timeBased on the control of the safe operation of the combustion equipment, the danger judgment for the CO concentration can be made accurately and with high accuracy, and the safety against CO gas poisoning can be significantly improved. it can.
[0044]
Further, in the present invention, even if the CO concentration is never detected by the sensor after the start of the combustion operation, a low-level CO gas that cannot be detected by the sensor is generated during the blank time when the CO concentration is not detected. And estimate the concentration of the generated CO gas. When a person is exposed to the atmosphere with the estimated CO concentration, the blood hemoglobin CO concentration is estimated.DegreeSince the combustion limit time is set within the range of the time when the dangerous concentration is reached, and the combustion operation is stopped when the combustion time reaches the combustion limit time, low-level CO gas not detected by the sensor Therefore, the safety against the CO gas is effectively performed even when the gas is generated, and the safety measures against the CO gas are completed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a CO safety device for a combustion apparatus according to the present invention.
FIG. 2 is a flowchart showing a safety operation of the embodiment.
FIG. 3 is an explanatory diagram showing a relationship between a CO concentration and a time until the blood hemoglobin CO concentration reaches a dangerous concentration.
FIG. 4 is a simulation graph for calculating a time T at which a blood hemoglobin CO concentration becomes a dangerous reference concentration when exposed to a predetermined concentration of CO gas.
FIG. 5 is a schematic configuration diagram of a general water heater as a combustion device.
FIG. 6 is an explanatory diagram of an indoor installation state of the combustion equipment.
FIG. 7 is an explanatory diagram showing a rising state of a sensor output of a CO sensor.
FIG. 8 is an explanatory diagram showing an example of integration of blood hemoglobin CO concentration taken into blood.
FIG. 9 is an explanatory diagram of an occurrence state of a blank time when the concentration of CO gas generated is temporarily detected by a sensor during a combustion operation, and a calculation example of a blood hemoglobin CO concentration at this time.
FIG. 10 is an explanatory diagram of a blank time when the concentration of CO gas is not detected by the sensor even once during the combustion operation, and a calculation example of a blood hemoglobin CO concentration taken in the blank time.
[Explanation of symbols]
6 Control device
11 CO sensor
12 CO concentration detector
13 Blank time measurement section
14 Alarm output section
16 CO concentration estimation calculation unit
17 Total CO concentration calculator

Claims (2)

A CO concentration detecting unit for detecting a CO concentration in exhaust gas of a combustion device by a sensor, a blank time measuring unit for measuring a blank time during which the CO detection signal from the sensor is not employed during the combustion operation of the burning device, A CO concentration estimating calculation unit for estimating a blood hemoglobin CO concentration taken into the blood when exposed to an exhaust gas atmosphere having a low estimated CO concentration that cannot be detected by the sensor for a time; Calculates the blood hemoglobin CO concentration taken into the blood when exposed to the CO gas atmosphere having the detected CO concentration based on the CO concentration detection data detected by the above, and calculates the calculated blood hemoglobin CO concentration by the CO concentration estimation calculation. A total CO calculating unit that integrates the estimated blood hemoglobin CO concentration determined by the unit, and a total CO calculating unit. CO safety device combustion device having an alarm output unit for blood hemoglobin Total CO concentration is because outputs an alarm signal when exceeding the alarm reference value given in advance. A CO concentration detecting unit for detecting a CO concentration in exhaust gas of a combustion device by a sensor, a blank time measuring unit for measuring a blank time during which the CO detection signal from the sensor is not employed during the combustion operation of the burning device, A CO concentration estimating calculation unit for estimating a blood hemoglobin CO concentration taken into the blood when exposed to an exhaust gas atmosphere having a low estimated CO concentration that cannot be detected by the sensor for a time; Calculates the blood hemoglobin CO concentration taken into the blood when exposed to the CO gas atmosphere having the detected CO concentration based on the CO concentration detection data detected by the above, and calculates the calculated blood hemoglobin CO concentration by the CO concentration estimation calculation. CO total calculation unit for integrating the estimated hemoglobin CO concentration in blood obtained by the unit, and a CO detection signal from the sensor during the combustion operation When the combustion operation time from the start of the combustion operation is not output when the exposure is performed in the exhaust gas atmosphere having the estimated CO concentration, the hemoglobin CO concentration in the blood reaches a preset combustion limit time within the risk time when the concentration reaches the dangerous concentration. And a combustion operation stop unit that stops the combustion operation when the temperature of the combustion engine is reached.

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